Another one:Text editor goes blank when 123ContactForm is active

Although the previous thread is marked “resolved”, I am running into the same problem. The 123 plugin is marked compatible up to WP 4.2.3 and I notice on some – not all themes – the editor going blank.
Error message: Failed to load: https://…../plugins/123contactform-for-wordpress/editor_plugin.js.

Seems to be a conflict there.

Thanks

https://wordpress.org/plugins/123contactform-for-wordpress/